Build a Binary Clock with Elixir and Nerves

What You Built

This chapter has the entire software layer for the project. The functional core creates time structs with a constructor and converts them to convenient formats for different use cases. The core provides logic for three adapters with identical interfaces but different implementations for hardware, IEx, and tests. Together, these features show time upon request.

The service layer processes periodic requests for time and delegates the task of showing the local time to configurable adapter layers. The lifecycle layer uses supervisors to automatically start the service layer if needed.

Why It Matters

Core layers are important because they express complex logic in pure functions without needing to manage complexity. Adapters allow clients ...